Hamilton Watch Khaki Aviation X-Patrol Auto. Propelling its pioneering aviation spirit to new heights in the year of the brandÕs 120th anniversary is the dynamic Hamilton Khaki X-Patrol. This highly sophisticated chronograph integrates the new H-21 caliber with its excellent accuracy and extended power reserve. Equipping the wearer for todayÕs globally minded environment is a unique mechanical conversion facility to give accurate equivalents of a selection of units in either metric or imperial systems.